Want to create extra living space without sacrificing your garden? A roof extension not only provides more space and light, it also increases the value of your home. Are you curious about the possibilities of expanding your living space with an extra bedroom or bright workplace? In this article, read all about the prices, possibilities and advantages.
What does a roof structure cost?
If you want more extra space than a dormer can provide, go for a roof structure. On average, having a roof structure installed costs £18,750. See the average roof structure costs in the overview below.
| Type of structure | Size | Price |
|---|---|---|
| Retracted ridge sloping roof | 3 m wide | £ 10.000 – £ 15,000 |
| Roof extension sloping roof | 3 m wide | £ 16,000 – £ 21,000 |
| Roof extension flat roof | 25 m² | £ 25,000 – £ 30.000 |
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Do you need a permit for a roof structure?
Yes, always. Whereas you can still sometimes build a dormer without a permit, a roof structure always requires a permit. This is because whether a superstructure is allowed or not depends on the zoning plan. This plan specifies what an area may be used for and what may and may not be built. You can apply for the so-called single permit at the Environment Counter.
There are costs involved in applying for this single permit. The fees charged by municipalities are often around 2% of the total construction costs. The exact percentage varies from one municipality to another. You also need at least construction drawings and structural calculations for the permit application.
What is a roof structure?
Does a dormer not provide enough extra space to stand on? With a roof structure, you expand your home with extra room or floor on top of your home. Useful if, for example, there is no room for an extension or extension to the house, or you don’t want to sacrifice the garden. A roof structure is often used on flat roofs, but can just as easily be built on a sloping roof.
You can choose to have the roof structure delivered prefabricated or built on site. With a prefabricated structure, the construction is already assembled in the factory. It then only has to be lifted onto your house, which saves a lot of time, construction waste and working hours.
Possibilities for a roof structure
If you opt for a roof structure, there are several possibilities. A superstructure is custom-made so your wishes for dimensions, for example, can be taken into account. For this extension to your house, you can choose:
- Roof extension flat roof
- Roof extension sloping roof
- Retracted ridge sloping roof
Roof extension flat roof
A flat roof extension provides an extra storey on top of your current house. This can also be, for example, a superstructure on the garage or a superstructure on the extension.
Ridge-raising sloping roof
With a ridge-raising, the sloping roof is raised on two sides. This allows you to create a completely new storey and more floor space.
Retracted ridge raising
With a retracted ridge, the sloping roof is raised on one side. This means you move the ridge (the highest point) of the roof. This creates extra space on one side of the attic. A relocated ridge is also called a one-sided ridge rise.
Distribution of roof structure costs
The prices for a roof structure are structured as follows:
As you can see, the largest part of the total roof structure costs consists of material costs. This includes the structure itself, the frames and extra options. You can influence the amount of this price by the choices you make.
What choices determine the price of a roof structure?
If you have a roof structure installed, the total price of the roof structure is based on the various choices you make. We explain some of these choices.
Choice 1: The type
The first factor that determines the price is the type of roof structure you choose. Your roof is a determining factor here. Like most Dutch people, do you have a pitched roof? Then you have two options: the relocated ridge (one-sided raising of the roof) or a nokverhoging (two-sided raising of the roof. With a flat roof, an roof extension can be used to create an extra storey.
Choice 2: The finish
The second choice that determines the price of your roof extension is the material you use to finish it. Think for example of a plastic, or rather a wooden finish.
Choice 3: Additional options
The other additional options are not necessary, but worth considering to increase your living comfort. If you let the dormer specialist take care of them right away, you will immediately have nothing to worry about. You can always have extras included on your dormer quote and, upon approval of the quote, decide whether or not to do it.
| Option | Costs | Advantages | |
|---|---|---|---|
| Ventilation grille | £ 8 – £ 12 per decimetre | – good for a healthy living environment – prevents moisture problems |
|
| Tilt and turn window | £ 125 – £ 200 each | – easy to clean – two settings: ventilate and quick-through |
|
| Insect screen | £ 75 – £ 100 each | – keeps pesky insects out – easy to install in your skylight |
|
| Roll blind/screen | £ 500 – £ 1.000 each | – sleep in complete darkness – keep out heat in summer, £40 per element |
– create extra – storage space |
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Frequently asked questions
A roof structure costs on average £10,000 to £30,000 . The total cost of your project depends on the dimensions, the type of roof structure you choose and the finishing. Would you like to know how much a roof structure will cost in your situation? Request a quote without obligation.
A roof structure provides an extra floor or room on top of your house. This extension can be built on either a flat roof or a sloping roof.
Yes, you need an environmental permit for a roof structure. This is because whether or not you are allowed to build depends on your municipality’s zoning plan. Apply for the environment at the Omgevingsloket.
